Accrued Warranty (Detail) - Table (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Balance at beginning of year	$ 645	$ 466
Accrued warranty expense	728	517
Warranty claims paid	(725)	(330)
Translation adjustment	17	(8)
Balance at end of year	$ 665	$ 645